# Vehicles (Class 1 Invalid Carriages) Regulations (Northern Ireland) 1999, Regulation 5: Use of horn


The circumstances referred to in regulation 4(b) are that the invalid carriage is either—
(a) stationary on a road and is not in danger from another moving vehicle on or near the road; or
(b) in motion on a road which is a restricted road for the purposes of Article 37(1) of the Road Traffic Regulation (Northern Ireland) Order 1997 between 2330 hours and 0700 hours in the following morning.

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Source: https://www.legislation.gov.uk/nisr/1999/479/regulation/5 (the official version)
Page: https://openlegislation.uk/vehicles-class-1-invalid-carriages-regulations-northern-ireland-1999/regulation-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.